Malicious PDF — malware analysis report

Static analysis result for SHA-256 977688030f2f7738…

MALICIOUS

PDF

83.9 KB Created: 2021-09-17 14:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e64d8c109b201187ce6bdc603913c5f3 SHA-1: 3fc926436c66054d71103237789ad1413d04e87a SHA-256: 977688030f2f7738f0ed28492d3d55ae7030f7a1bd72c3572a1731d2b4635d62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to malicious websites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crewmak.ru/uplcv?utm_term=click+beetle+australia PDF link annotation
    • https://culturasiapamplona.com/guiarte_userfiles/files/24257470112.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/b4cb6afc0bcd415a6e1dffde0f15f2cf/10242800159.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/43173171891.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/92480913204.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/68248625693.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/ninojaboralusemukidazakeg.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/25136713802.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/a4dkcb2uk02030frohdepgtiam/wafojujoze.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109102237586955.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/843a395b6af7c09c364e00014a04f532/82524273831.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090217484480554.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/80759987914.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/burerasimokidugurodoxow.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/61229141338.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/kegobaponimoka.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/15800489754.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/9161908969.pdfIn PDF document text
    • http://adveotec.com/img/file/liperuvegovupubutorewatom.pdfIn PDF document text
    • http://yibetter.com/data/files/84274591954.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/vatifinetowudemusu.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/16293368646.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE042 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF854 19300 bytes
SHA-256: 8c4b7d1f92be13033b3bb9b1a1ee3c6fcbbc15100bf0485610379a2e06d9bd6a
font_02_sfnt_off00012ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB5 10364 bytes
SHA-256: f9e5d43193227f6db5559c4bb83f2a53cb2f8955c0372d285d879d269e5f1114